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Card Guides and Polarizing Keys

Card Guides and Polarizing Keys
 

Edge Connector Card Guides and Polarizing Keys

What is a card edge connector card guide?

The card guides are attached to the card edge connector to help ensure proper alignment when inserting the mother or daughter card into the connector slot.



Card edge connector with card guide









Edge connector with card guide









Card guide engineering options

In-line or offset card guide options are available. Card guides can be purchased factory installed or can be purchased separately and assembled in the field.

In-line and offset card guide for edge connector










What is polarizing key?

A polarizing key is a feature that can be added to a card edge connector so that only the proper PC board can be inserted into the connector. The key acts as a stop and prevents improper boards from being inserted into the connector. Only boards with a cut out matching the location of the polarizing key in the connector can be inserted into the connector. The key also prevents a PC board from being inserted incorrectly/backwards into the connector.


Polarizing key for edge connector












Polarizing key engineering options

There are four basic keying options, in-contact, between contact, molded in-contact, molded between contact. In-contact keys are installed or molded over a pair of contacts in the connector. The more common between contact key is installed or molded between two pairs of contacts, therefore not eliminating a pair of contacts for use with the PC board.

In-contact and between contact polarizing key








Edge connector with molded polarizing key












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